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An international team of scientists led by researchers at The Wistar Institute has combined two different imaging techniques to uncover the molecular-level framework of a common bacteriophage, a virus that infects bacteria. The results, reported in the October issue of Nature Structural Biology, suggest that viruses developed a continuum of progressively more complex architectural strategies to cope with their increasing size as they evolved. An image from the study is featured on the journal’s
Orbit affects climate on Mars similar to the way it affects climate on Earth, say three scientists, who used a model of climate change on Earth to explain the layers of deposits in the polar regions of the Red Planet.
Their study appears in the Sept. 26 issue of Nature, and suggests that a climate change theory for Earth can also be applied to Mars and possibly to other Earth-like planets.
“The orbital theory of climate change has been successful in explaining changes in the Earth&
According to Douglas Adams, in his famous book The Hitch-Hikers Guide to the Galaxy, space is big. However, it seems near-Earth space is not big enough. In December 2001, the Space Shuttle pushed the International Space Station away from a discarded Russian rocket booster that was due to pass uncomfortably close. Space litter is a growing problem but smarter satellite design may help in the future.
From the beginning of the space era, satellites and deep-space probes have populated the Solar
One of the known facts about landfalling hurricanes is their rapid decay, yet some of them retain tropical storm winds and gusts well inland. While studies have shown that the reduction in surface evaporation is a reason for hurricane decay during landfall, little is known about the effect of land surface water on the intensity of hurricanes.
In a recent issue of the Journal of Atmospheric Sciences, URI Graduate School of Oceanography (GSO) physical oceanographer Isaac Ginis, Weixing Shen, f
University of Melbourne scientists have found clues to why patients with insulin-dependent diabetes are often unable to sense their need to take life-saving glucose.
The evidence came from a known and potent appetite stimulant released by the brain called Neuropeptide Y (NPY). Studies using diabetic rats have shown the NPY levels in the brains of diabetic rats differ significantly to those of normal rats under conditions of low glucose.
It was known that specific nerves in the bra
While biomedical devices such as prosthetic heart valves, heart-assist devices, oxygenators, vascular grafts and hemodialysis systems can help to save or significantly extend lives, these same devices also can damage the blood cells which travel through them. Severe consequences can result when blood cells are damaged or broken down, said Marina Kameneva, Ph.D., research associate professor of surgery at the University of Pittsburgh School of Medicine.
Dr. Kameneva will discuss the issue in